Explain how sound is produced by your school bell?
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when school bell is heated by any solid metal then it start vibrating and produce sound.
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air is commonest material through which sound propagates when is school bell is rung it pushes the molecules of air in front of it this inturn compress the air thus creating a region of high pressure and high density called compression this compression in air Travels forward when the bell moves back it creates a region of low pressure in air commonly called rare fraction due to this compression and refraction sound is produced by Bell
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